Question The following table shows the annual percentage change in volume (which can be understood as quantity ) and price of the sales of goods sold in certain types of stores in Hong Kong based on the retail sales survey conducted by the Hong Kong Census and Statistics Department. 2019 2020 Types of stores Percentage change Percentage change Percentage change Percentage change (sectors) in price from the in volume from the in price from the in volume from the previous year previous year previous year previous year Food + 5.8% 8.7% +5.8% -17.5% Supermarkets +5.8% -5.6% +5.5% +5.6% Clothing and -1.6% 12.7% -5.6% -37.1% Footwear Consumer durables -1.8% 10.4% -1.3% 8.9% Department Stores -0.5% 12.6% + 1.2% 23.4% Jewellery + 1.7% 23.7% +7.5% -57.2% Medicines and +1.5% -14.5% +1.2% -50.6% Cosmetics Note: 1. Values of goods used together with provision of services are not included in the retail sales statistics. (For example, value of food in restaurant dining is not included in the food category above.) 2. Purchases by tourists at these stores are included in the statistics. Note that for some types of stores, a high proportion of sales are to tourists. Choose TWO types of stores (sectors) in the table above and analyze the change in price and quantity for each of the two types of stores (sector) using the demand-supply analysis and possibly together with other theories you have learned in this course so far